<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<table border="1">
  <thead>
  <tr>
    <th>浏览器</th>
    <th>渲染引擎</th>
    <th>JavaScript 引擎</th>
  </tr>
  </thead>
  <tbody>
  <tr>
    <th>Chrome</th>
    <td>Blink</td>
    <td>V8</td>
  </tr>
  <tr>
    <th>Opera</th>
    <td>Blink</td>
    <td>V8</td>
  </tr>
  </tbody>
</table>

<table border="1">
  <thead>
  <tr>
    <th>浏览器</th>
    <th>渲染引擎</th>
    <th>JavaScript 引擎</th>
  </tr>
  </thead>
  <tbody>
  <tr>
    <th>Chrome</th>
    <td>Blink</td>
    <td>V8</td>
  </tr>
  <tr>
    <th>Opera</th>
  </tr>
  </tbody>
</table>

<table border= "2">
  <thead>
  <tr>
    <th>浏览器</th>
    <th>Chrome</th>
    <th>Opera</th>
    <th>Firefox</th>
    <th>Edge</th>
  </tr>
  </thead>
  <tbody>
  <tr>
    <th>渲染引擎</th>
    <td colspan="2">Blink</td>
    <td>Gecko</td>
    <td>Edge</td>
  </tr>
  </tbody>
</table>

<table>
<colgroup>
  <col span="2" style="background-color: antiquewhite;">
  <col span="1" style="background-color: peachpuff;">
</colgroup>
<tr>
  <th>列1</th>
  <th>列2</th>
  <th>列3</th>
  <th>列4</th>
</tr>
<tr>
  <td>单元格1</td>
  <td>单元格2</td>
  <td>单元格3</td>
  <td>单元格4</td>
</tr>
</table>

</body>
</html>